S5470 datasheet(12/24 Pages) SII

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ULTRA-LOW CURRENT CONSUMPTION PHOTOCURRENT DETECTION IC

S-5470 Series

Rev.1.2_00

Seiko Instruments Inc.

Explanation of terms

4. 1

Detection current (IDET)

The detection current (IDET) is the current at which the output switches to "H".

The detection current varies slightly even among products with the same specification. The variation in detection

current from the minimum detection current (IDET min.) to the maximum detection current (IDET max.) is called the

detection current range (refer to Figure 18).

Detection current

Detection

current range

IINP

IDET max.

IDET min.

VOUT

Figure 18

Detection Current

4. 2

Release current (IREL)

The release current (IREL) is the current at which the output switches to "L".

The release current varies slightly even among products with the same specification. The variation in release

current from the minimum release current (IREL min.) to the maximum release current (IREL max.) is called the

release current range (refer to Figure 19).

The range is calculated from the actual detection current (IDET) of a product and is in the range of IDET

× 0.7 ≤

IREL

≤ IDET × 0.9.

Release current

Release

current range

IINP

IREL max.

IREL min.

VOUT

Figure 19

Release Current

4. 3

Hysteresis width

The hysteresis width is the current difference between the detection current and the release current (current at

point B

− current at point A in "Figure 14 Operation when Detecting Certain Photocurrent Level" and

"Figure 16

Operation when Detecting the Difference of Photocurrent Level

").

The hysteresis width between the detection current and the release current prevents malfunction caused by

noise in the input current.

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